my new puppy (3 months)doesn't seem to stop biting my older dog (3 years), we have left them together to see what they do supervising them of course..that little puppy bites hard! it feels like little needles! my elder dog also bites her..looks like its playing around but i noticed the other day that my older dog has a blood scab on his tummy and i think it might have been from the puppy biting him..i dont like them when theyre biting eachother because my elder dog bites her on the neck and she is so tiny...is this normal lol...i am currently keeping them separated with the dog walls...they both look like they like it but sometimes i see either my old dog or the puppy trying to get away from the situation..im terrified when they go under my bed because if someone gets hurt i can't reach them...my older dog is sleeping with me since that's how its always been and the puppy is sleeping with my mom in a separate room...i also see her biting on his skin and pulling it so i break it off..what do i do?